Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bef4976869b4ee…

MALICIOUS

PDF

94.3 KB Created: 2021-10-12 20:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 156883b63323a7c101d55ad5b8faf674 SHA-1: 631c569f5fb66eedcfcbe30435e2679310cc7043 SHA-256: d8bef4976869b4ee3fa535161534bbac90498c1e130ea4f529e7e78a28506fe1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to external PDFs hosted on compromised WordPress sites and other domains. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing malicious content through link farms. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, as suggested by the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/81q3sia7iv0h5tkqepfgl2qtm1/mafixagurobokux.pdf In PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/bufafugopitufunotijejinu.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/xagobitexexogaxibaxakupug.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/81549189557.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/wezerasanevig.pdfIn PDF document text
    • http://hadt.vn/upload/files/lonagi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f3i0nl0adop0orkrrum1elavk/74126427192.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/13385286258.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210915_103326.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/vixinadeligup.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/16563696250.pdfIn PDF document text
    • http://installmysolar.com/userfiles/file/gaxegixovoz.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/39851169379.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/nironakijizipukovosozes.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161419d9f80f12---86624859941.pdfIn PDF document text
    • http://palami.by/images/file/dagesisuleludituwikaw.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_8DCCDA3675CD86E3.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/k5rq0t9r2dug3b52l025lfs49t/42071872075.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/68598977859.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b6bc4abc---12009535935.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/dodegusabufutaxevomumabid.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/gikifudanawunutusadakena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=tsh+levels+in+cushing%27s+syndromePDF link annotation
    • https://b2cdemo.tickets.com/content/files/21863810356.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 10832 bytes
SHA-256: 246cee7c47bf90d3332e0957fd0c617dbc8b130b3158baebd800da3f81a1b4d4
font_01_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 18540 bytes
SHA-256: 0d0e25b39a8fa42d649fd28c183aa5108aa798a736dfe6b8d6cc65d8ee83181d
font_02_sfnt_off00015337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.